查找密钥的索引？字典.NET

using System;
using System.Collections.Generic;

class Program
{
    static void Main(string[] args)
    {
        Dictionary<string, int> keyIndexDictionary = new Dictionary<string, int>();

        // 添加密钥和索引
        keyIndexDictionary.Add("key1", 0);
        keyIndexDictionary.Add("key2", 1);
        keyIndexDictionary.Add("key3", 2);

        // 查找密钥的索引
        string targetKey = "key2";
        if (keyIndexDictionary.ContainsKey(targetKey))
        {
            int index = keyIndexDictionary[targetKey];
            Console.WriteLine("The index of the target key is: " + index);
        }
        else
        {
            Console.WriteLine("The target key is not found in the dictionary.");
        }
    }
}